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ML4771CS 数据表(PDF) 6 Page - Micro Linear Corporation

部件名 ML4771CS
功能描述  High Current Boost Regulator
Download  8 Pages
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制造商  MICRO-LINEAR [Micro Linear Corporation]
网页  http://www.microlinear.com
标志 MICRO-LINEAR - Micro Linear Corporation

ML4771CS 数据表(HTML) 6 Page - Micro Linear Corporation

  ML4771CS Datasheet HTML 1Page - Micro Linear Corporation ML4771CS Datasheet HTML 2Page - Micro Linear Corporation ML4771CS Datasheet HTML 3Page - Micro Linear Corporation ML4771CS Datasheet HTML 4Page - Micro Linear Corporation ML4771CS Datasheet HTML 5Page - Micro Linear Corporation ML4771CS Datasheet HTML 6Page - Micro Linear Corporation ML4771CS Datasheet HTML 7Page - Micro Linear Corporation ML4771CS Datasheet HTML 8Page - Micro Linear Corporation  
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6
ML4771
Figure 7. Sample PC Board Layout
OUTPUT CAPACITOR
The output capacitor filters the pulses of current from the
switching regulator. Since the switching frequency will
vary with inductance, the minimum output capacitance
required to reduce the output ripple to an acceptable level
will be a function of the inductor used. Therefore, to
maintain an output voltage with less than 100mV of ripple
at full load current, use the following equation:
C
L
V
OUT
OUT
=
™
44
(2)
The output capacitor’s Equivalent Series Resistance (ESR)
and Equivalent Series Inductance (ESL), also contribute to
the ripple. Just after the NMOS transistor, Q1, turns off, the
current in the output capacitor ramps quickly to between
0.5A and 1.5A. This fast change in current through the
capacitor’s ESL causes a high frequency (5ns) spike to
appear on the output. After the ESL spike settles, the output
still has a ripple component equal to the inductor
discharge current times the ESR. To minimize these effects,
choose an output capacitor with less than 10nH of ESL
and 100m
W of ESR.
Suitable tantalum capacitors can be obtained from the
following vendors:
AVX
(207) 282-5111
Kemet
(846) 963-6300
Sprague
(207) 324-4140
DESIGN CONSIDERATIONS (Continued)
Figure 5. Efficiency vs. IOUT Using the Circuit of Figure 8
Figure 4. IOUT vs. VIN Using the Circuit of Figure 8
Figure 6. No Load Input Current vs. VIN
1000
800
600
400
200
0
VIN (V)
1.5
2.5
3.5
5.5
4.5
VOUT = 3.0V
VOUT = 5.5V
90
80
70
60
IOUT (mA)
1
10
100
1000
VOUT = 3.0V
VOUT = 5.5V
VIN = 2.4V
160
120
80
40
0
VIN (V)
1.5
2.5
3.5
5.5
4.5
VOUT = 3.0V
VOUT = 5.5V


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